Is it necessary to include the default standard tld files in WEB-INF folder for JSTL Tags to work properly.

Few standard tld files

c.tld
c-1_0.tld
x.tld
fmt.tld
sql.tld

The necessary tld files are already contained within standard.jar. There is no need to extract them and place them anywhere else. In fact, doing so is a poor idea as it makes it possible for the tld’s and the jars to be out of sync with each other.

Hence jstl.jar and standard.jar files are sufficient which has to be included in WEB-INF/lib folder.